$\left(3x^m+4y^n\right)\cdot\left(3x^m-7y^n\right)$
$15m+5m$
$\frac{\left(2sinxcosx-1\right)}{cosxsinx}$
$-\left(-6+10-3\right)$
$\lim_{x\to3}\left(\frac{3x^2-26}{x-4}\right)$
$\left(m+n+u\right)\left(m-n-u\right)$
$-1099+103-97$
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